Need advice to do content due diligence

Hi guys,

I usually use content writing services like textbroker.com to get my content written but they are slightly more expensive. Recently I have started to use freelancer I can find in upwork, fiverr and other places. There's one writer from India I've got who just produced a piece of content with my targeted keyword within 1 hour for 1500words.

The article is well written I'd say, it's not something I can do myself.

Not saying it's impossible to write 1500 words in under 1 hour. It's really not that easy.

Please can you advise how can I do due diligence to ensure they are legit? i.e not stolen, plagiarised or used AI?

I only have used https://www.check-plagiarism.com so far. I'm going to purchase Grammarly to help me a bit more.

Regards

All content writing service providers use AI writing tools these days, NO MATTER WHAT THEY CLAIM.
As long as content is plagiarism free and free from grammar, spelling, etc mistakes, then the content is good enough to be published AND also good enough in the eyes of Google, etc.
AND >>> As long as content is plagiarism free and free from grammar, spelling, etc mistakes, there is no way you can know if it is an AI generated or a human generated (written) content.

Ok thanks for your input